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No. 624,607. Patented May 9, I899. D. ALMY.

STEAM GENERATOR.

(Application filed Oct. 18, 1898.; {No Model.) 2 Sheets-Sheet I.

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No. 624,607. Patented May 9, I899.

' D. ALMY.

STEAM GENERATOR.

(Application filed. Oct. 18, 1898.; (N0 Modal.) 2 Sheets-Sheet 2.

INVENTDE .ll IHI I IJIIAII UNITED STATES PATENT OFFICE.

DABi/VIN ALMY, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE ALMY IVATER TUBE BOILER COMPANY, OF SAME PLACE.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 624,607, dated May 9, 1899.

Application filed October 18, 1898. Serial No. 693,368. (No model.) i

To atZZ whom it may concern.-

Be it known that I, DARWIN ALMY,of Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Steam-Generators; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification. I

Water-tube steam'generators made up of pipes and fittings require a rapid circulation of the water in the pipes and fittings exposed to the heat of the fire, so as to prevent the overheating of the pipes and fittings. To insure this rapid circulation of the water is the object of my present invention.

The invention consists in the peculiar and novel construction and arrangement of the steam-generating pipes, whereby the water supplied to the main steam-generating pipes on each side of the furnace and ascending through the side pipes on each side of the furnace and a series of pipes extending over the furnace is delivered into a central manifold connected with a transversely-extendin g manifold and from which it is returned by pipes exposed to less heat to the lower manifolds, as will be more fully set forth hereinafter.

Figure 1 is a vertical transverse sectional view of my improved water-tube steam-generator. Fig. 2 is a side view of the same with the side of thecasing removed, so as to more clearly show the arrangement of the pipes.

Similar marks of reference indicate corresponding parts in both figures.

In the drawings, a aindicate the manifoldtubes on each side of the furnace, extending along each side of the grate on, as is shown in Fig. 1. The fittings b b are connected with the manifolds a by nipples. The fittings b are tapped to receive four of the pipes c c,

which extend vertically on each side of the furnace and are connected by elbow-fittings with the slightly-inclined inward-extending pipes c c, which are connected by suitable fittings to the inclined outward-extending pipes 0 connected by fittings with the pipes c 0 extending toward the center, and which are connected by the vertical pipes c c to the the lower rear manifold a four-branch fittings b l), which are connected with the centrally-extendin g separator-manifold d, from which extend the lateral manifolds d, and these are connected, by means of connected at their lower ends with the fourway fittings b 12 connected by nipples with I The casing e, inclosing the boiler g, indicates the firing-doors, giving access to the furnace and the ash-pit.

The-pipes c, 0 and 0 with their connect ing fittings, extend over the furnace and are exposed to the direct action of the fire and form six layers of the most efiicient steamgenerating surfaces. The pipes c c extend 7o rearward over and above the pipes c c and are exposed to less heat. The water supplied from the manifolds a a ascends through the side pipes c c'and, passing through the pipes 0, c and c enters the central separa tor-manifold 61 through the pipes c and c as saturated steam, carrying more or less water with it. Much of the water separates as the steam andwater enters the central manifold d and passes into the manifoldd, from which the water descends through the pipes c and c to the lower rear manifold a and through it reaches the side manifolds a a, thereby producing a rapid circulation of the water and the separation of the water from the steam.

By this construction the part of the generator exposed to the fiercest action of the fire is composed of a series of sections or units, consisting of a four-branch fitting b, the pipes c c c c c c 0 0 c 0 and the four-branch fit- 9o ting I), connected with the central manifold d'and one of the lower side manifolds a. The lower connection of each section with the manifold a is easily reached from the furnace, and the connections with theupper manifold 5 d can be easily reached in the uptake, so that any section can be readily disconnected, removed, and replaced without removing the casing. v

Having thus I described my invention, I too claim as new and desire to secure by Letters Patent-- 1. In a water-tube steam generator, the combination with the lower manifolds located on each side of and on the rear of the furnace and the central upper manifold having two laterally-extendin g manifolds connected with the front thereof, of a series of pipes connected by fittings and extending from the lower manifolds on each side of the furnace upward, inward and outward over the furnace and thence to the central upper manifold, and a series of pipes connected by fittings extending from the upper branch manifolds to the lower rear manifold; whereby the heat of the fire is exerted mainly on the pipes forming the sides and extending over the furnace, the water and steam is carried upward into the central manifold and the water is returned to the rear lower manifold, thereby securing the rapid circulation of the water and the separation of the steam, as described.

2. In a water-tube steam-generator, the combination with the lower manifolds a a on each side of the furnace, the lower manifold 00 at the rear of the furnace, the central upper manifold d and the branch manifolds d" d, of the four-branch fittings b I) connected with the lower side manifolds, the four-branch I fittings b I) connected with the central manithe water is returned to the lower manifolds, as described.

3. In a water-tube steam-generator, the combination with the upper central manifold and a lower side manifold, of units, forming the main heating-surface of the generator, consisting of a lower four-branch fitting, four vertical pipes c 0 four pipes c c, c c and c c extending over half of the furnace, the four pipes 0 the upper four-branch fitting b, and connections with the four-branch fittings, the

lower side manifold and the upper central manifold, whereby each unit, or section, may be removed or replaced, as described.

In witness. whereof I have hereunto set my hand.

DARWIN ALMY.

\Vitnesses:

J. AQMILLER, J r., B. M. SIMMs. 

